116 research outputs found
Analisis Portofolio Optimal Dengan Single Index Model Untuk Meminimumkan Risiko Bagi Investor Di Bursa Efek Indonesia (Studi Pada Saham Indeks Kompas 100 Periode Februari 2010-juli 2014)
Investments can be made in the capital market, capital market instruments which are mostly attractive for investors is stock. Stock provides a return in the form of capital gains and dividends yield, not only noticing the return, investors need to pay attention to the investments risk. Unsystematis risk can be minimized by forming the optimal portfolio using one of the methods that is single index model. Study purpose is to knowing the stocks forming the optimal portfolio, the proportion of funds allocated to each stocks, the level of expectation return and risk.The method used in this research is descriptive research method with a quantitative approach. The samples used were 46 stocks in Kompas 100 Index, which meets the criteria for sampling. The results showed that 12 stocks of forming optimal portfolio, the stocks of which are UNVR, TRAM, MNCN, BHIT, JSMR, BMTR, GJTL, KLBF, AALI, CPIN, AKRA, and ASRI. Stock with highest proportion of funds is TRAM (23,52%), stock with lowest proportion of funds is AALI (0,62%). Portfolio which are formed will give return expectations by 3,05477% and carry the risk for about 0,1228%
Additional file 1: Table S1. of metaX: a flexible and comprehensive software for processing metabolomics data
The fold change and p-value for all of the features. (XLSX 146 kb
Additional file 3: Table S3. of metaX: a flexible and comprehensive software for processing metabolomics data
The centrality metrics for each node in the network. (XLSX 22 kb
Additional file 2: Table S2. of metaX: a flexible and comprehensive software for processing metabolomics data
The pathway analysis results for the 8 selected biomarkers. (XLSX 14 kb
A Simple Strategy for Fabrication of “Plum-Pudding” Type Pd@CeO<sub>2</sub> Semiconductor Nanocomposite as a Visible-Light-Driven Photocatalyst for Selective Oxidation
The Pd@CeO<sub>2</sub> semiconductor nanocomposite with “plum-pudding” structure has been fabricated successfully via a facile low-temperature hydrothermal reaction of polyvinylpyrrolidone (PVP)-capped Pd colloidal particles and cerium chloride precursor followed by a calcination process in air. Different characterization techniques, including X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission scanning electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), UV–vis diffuse reflectance spectra (DRS), X-ray photoelectron spectra (XPS), photoluminescence spectra (PL), nitrogen adsorption–desorption, and electron spin resonance spectra (ESR), have been used to investigate the structure and properties of the Pd@CeO<sub>2</sub> nanocomposite. It is found that the nanosized Pd particles are evenly dispersed into the matrix of CeO<sub>2</sub>, thus forming a plum-pudding structure, i.e., multi-Pd core@CeO<sub>2</sub> shell configuration. This unique nanostructure endows the Pd@CeO<sub>2</sub> nanocomposite with enhanced activity and selectivity toward the visible-light-driven oxidation of various benzylic alcohols to corresponding aldehydes using dioxygen as oxidant at room temperature and ambient pressure compared with a supported Pd/CeO<sub>2</sub> nanocomposite and nanosized CeO<sub>2</sub> powder. The formation of the multi-Pd core@CeO<sub>2</sub> shell structure can be understood by a synergistic interaction of heterogeneous seeded growth process, monolayer-capped core coalescence, and shell re-encapsulation. Together with the previous report, it can be concluded that the intrinsic structure nature of noble metal colloids is able to play a key role in affecting the formation process of noble metal core@semiconductor shell nanocomposites, by which we can realize the design and preparation of different specific core–shell nanostructures with atomic scale accuracy. It is hoped that our current work could open promising prospects of the fabrication of multimetal core@semiconductor shell nanocomposites and their application to visible-light-driven selective organic transformations
Synthesis of One-Dimensional CdS@TiO<sub>2</sub> Core–Shell Nanocomposites Photocatalyst for Selective Redox: The Dual Role of TiO<sub>2</sub> Shell
One-dimensional (1D) CdS@TiO<sub>2</sub> core–shell
nanocomposites
(CSNs) have been successfully synthesized via a two-step solvothermal
method. The structure and properties of 1D CdS@TiO<sub>2</sub> core–shell
nanocomposites (CdS@TiO<sub>2</sub> CSNs) have been characterized
by a series of techniques, including X-ray diffraction (XRD), ultraviolet–visible-light
(UV-vis) diffuse reflectance spectra (DRS), field-emission scanning
electron microscopy (FESEM), photoluminescence spectra (PL), and electron
spin resonance (ESR) spectroscopy. The results demonstrate that 1D
core–shell structure is formed by coating TiO<sub>2</sub> onto
the substrate of CdS nanowires (NWs). The visible-light-driven photocatalytic
activities of the as-prepared 1D CdS@TiO<sub>2</sub> CSNs are evaluated
by selective oxidation of alcohols to aldehydes under mild conditions.
Compared to bare CdS NWs, an obvious enhancement of both conversion
and yield is achieved over 1D CdS@TiO<sub>2</sub> CSNs, which is ascribed
to the prolonged lifetime of photogenerated charge carriers over 1D
CdS@TiO<sub>2</sub> CSNs under visible-light irradiation. Furthermore,
it is disclosed that the photogenerated holes from CdS core can be
stuck by the TiO<sub>2</sub> shell, as evidenced by controlled radical
scavenger experiments and efficiently selective reduction of heavy-metal
ions, CrÂ(VI), over 1D CdS@TiO<sub>2</sub> CSNs, which consequently
leads to the fact that the reaction mechanism of photocatalytic oxidation
of alcohols over 1D CdS@TiO<sub>2</sub> CSNs is apparently different
from that over 1D CdS NWs under visible-light irradiation. It is hoped
that our work could not only offer useful information on the fabrication
of various specific 1D core–shell nanostructures, but also
open a new doorway of such 1D core–shell semiconductors as
visible-light photocatalysts in the promising field of selective
transformations
Synthesis of Uniform CdS Nanospheres/Graphene Hybrid Nanocomposites and Their Application as Visible Light Photocatalyst for Selective Reduction of Nitro Organics in Water
We
report the self-assembly of uniform CdS nanospheres/graphene
(CdS NSPs/GR) hybrid nanocomposites via electrostatic interaction
of positively charged CdS nanospheres (CdS NSPs) with negatively charged
graphene oxide (GO), followed by GO reduction via a hydrothermal treatment.
During this facile two-step wet chemistry process, reduced graphene
oxide (RGO, also called GR) and the intimate interfacial contact between
CdS NSPs and the GR sheets are achieved. Importantly, the CdS NSPs/GR
nanocomposites exhibit a much higher photocatalytic performance than
bare CdS NSPs toward selective reduction of nitro organics to corresponding
amino organics under visible light irradiation. The superior photocatalytic
performance of the CdS NSPs/GR nanocomposites can be attributed to
the intimate interfacial contact between CdS NSPs and the GR sheets,
which would maximize the excellent electron conductivity and mobility
of GR that in turn markedly contributes to improving the fate and
transfer of photogenerated charge carriers from CdS NSPs under visible
light irradiation. Moreover, the photocorrosion of CdS and the photodegradation
of GR can be efficiently inhibited. The excellent reusability of the
CdS NSPs/GR nanocomposites can be attributed to the synergetic effect
of the introduction of GR into the matrix of CdS NSPs and the addition
of ammonium formate as quencher for photogenerated holes. It is hoped
that our current work could promote us to efficiently harness such
a simple and efficient self-assembly strategy to synthesize GR-based
semiconductor composites with controlled morphology and, more significantly,
widen the application of CdS/GR nanocomposite photocatalysts and offer
new inroads into exploration and utilization of GR-based semiconductor
nanocomposites as visible light photocatalysts for selective organic
transformations
Structure and Entanglement Factors on Dynamics of Polymer-Grafted Nanoparticles
Nanoparticles functionalized with
long polymer chains at low graft
density are interesting systems to study structure–dynamic
relationships in polymer nanocomposites since they are shown to aggregate
into strings in both solution and melts and also into spheres and
branched aggregates in the presence of free polymer chains. This work
investigates structure and entanglement effects in composites of polystyrene-grafted
iron oxide nanoparticles by measuring particle relaxations using X-ray
photon correlation spectroscopy. Particles within highly ordered strings
and aggregated systems experience a dynamically heterogeneous environment
displaying hyperdiffusive relaxation commonly observed in jammed soft
glassy systems. Furthermore, particle dynamics is diffusive for branched
aggregated structures which could be caused by less penetration of
long matrix chains into brushes. These results suggest that particle
motion is dictated by the strong interactions of chains grafted at
low density with the host matrix polymer
Additional file 3: Figure S1. of Improvement of peptide identification with considering the abundance of mRNA and peptide
The weights of features for (A) Jurcat cell line and (B) mouse liver datasets. (DOCX 140Ă‚Â kb
Waltzing with the Versatile Platform of Graphene to Synthesize Composite Photocatalysts
Waltzing with the Versatile Platform of Graphene to
Synthesize Composite Photocatalyst
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